The nature of Martin’s injury was not immediately known, but he was used sparingly in the preseason after leading the Raiders with 723 yards rushing last year. The 30-year-old Martin spent his first six NFL seasons with Tampa Bay before signing with Oakland last offseason. He re-signed with the Raiders in May after Isaiah Crowell was lost for the season with a knee injury.

Liuget played his first eight years with the Chargers. He has 24 career sacks, 274 tackles, 20 passes defensed and six forced fumbles.

Allen-Williams joins the team as an undrafted free agent out of South Carolina.

DePaola joined the Raiders last season, and has also had stints with Chicago and Tampa Bay.